function setCookie(name, value) {
  var Days = 30;
  var exp = new Date();
  exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
  document.cookie = name + '=' + escape(value) + ';expires=' + exp.toGMTString();
}

function getCookie(name) {
  var arr,
    reg = new RegExp('(^| )' + name + '=([^;]*)(;|$)');
  if ((arr = document.cookie.match(reg))) {
    return unescape(arr[2]);
  } else {
    return null;
  }
}
